/Engine/Source/Runtime/Engine/Public/Animation/AnimInstanceProxy.h
Get local weight of any montages this slot is playing. If this slot is not current playing a montage, it will return 0. This will return up to date data if called during Update or Evaluate.
float CalcSlotMontageLocalWeight ( const [FName](API\Runtime\Core\UObject\FName) & SlotNodeName ) const